Besides of the location the gym&pool were my main selection criteria.
Due to some issues with airbnb guests (?) the pool and gym were not accessible for me. However I was not informed in advance that the gym and the pool was not accessible to airbnb guests. No refund or deduction of the price took place either. This really spoiled my stay as I want a pool to relax after some serious walking around town and a gym to work out. I had to pay extra to use the gym and pool at a nearby hotel. For the additional price paid I could have stayed in the hotel in the first place.
Also, but less important for me, I am not sure if the multimedia system in place wasn’t working properly or if I just didn’t understand how to use it, but anyhow,.. I was not really able to use it (besides listening to music). In general, a little guideline manual would have been nice.
The apartment itself was nice. I liked the furniture, the bed was comfy and I liked the little kitchen and washing machine. Washing luiquid was provided!
Sukhumvit Soi 11 is a perfect place for me, as I used to work in Soi 12 and know the area pretty well. I did not mind the short walk to Nana Sky train or Asok Sky train / metro.. and there is always the option of taking a motor bike taxi, too.
I have felt safe in this neighborhood and although it does get busy at night time, the building is well isolated.
So, if you don’t mind having no pool and gym access, go ahead! Otherwise you are better of looking for another place.